Generate sources and headers in the build directory.
Generate sources and headers in the build directory.

This way the build can be done entirely outside the source tree, and
the resuls of different builds (including their generated intermediate
files) can be compared.

TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf